The Terracotta Army is functionally different in the World Wonders only version, as it includes an ability that I moved to the National Academy national wonder in that version. Unfortunately I don't think I can change that particular UI element as it is automatically generated by the game. Or to be more accurate, I think I could change it, but it would involve some lua coding that may make it incompatible with other UI mods which is not desirable to me. The National Wonder adjacency bonuses should only account for a few points of difference between different Civs, I don't think those by themselves are going to cause massive imbalances. But yes, those wonders are intended to strengthen districts in a way that makes a well-placed district worth a lot more than a district that isn't placed so well, and that will naturally affect Civs differently when some Civs have an easier time with adjacency bonuses. If the National Wonders appear too strong for you, there's always the World Wonders only version. For now I'll call that intended, though it could be something I add in the future. It'd only affect a small number of the National Wonders.